1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 *
4 * h3600 atmel micro companion support, key subdevice
5 * based on previous kernel 2.4 version
6 * Author : Alessandro Gardich <gremlin@gremlin.it>
7 * Author : Linus Walleij <linus.walleij@linaro.org>
8 */
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/fs.h>
12 #include <linux/interrupt.h>
13 #include <linux/sched.h>
14 #include <linux/pm.h>
15 #include <linux/sysctl.h>
16 #include <linux/proc_fs.h>
17 #include <linux/delay.h>
18 #include <linux/device.h>
19 #include <linux/input.h>
20 #include <linux/platform_device.h>
21 #include <linux/mfd/ipaq-micro.h>
22
23 static const u16 micro_keycodes[] = {
24 KEY_RECORD, /* 1: Record button */
25 KEY_CALENDAR, /* 2: Calendar */
26 KEY_ADDRESSBOOK, /* 3: Contacts (looks like Outlook) */
27 KEY_MAIL, /* 4: Envelope (Q on older iPAQs) */
28 KEY_HOMEPAGE, /* 5: Start (looks like swoopy arrow) */
29 KEY_UP, /* 6: Up */
30 KEY_RIGHT, /* 7: Right */
31 KEY_LEFT, /* 8: Left */
32 KEY_DOWN, /* 9: Down */
33 };
34
35 struct ipaq_micro_keys {
36 struct ipaq_micro *micro;
37 struct input_dev *input;
38 u16 codes[ARRAY_SIZE(micro_keycodes)];
39 };
40
micro_key_receive(void * data,int len,unsigned char * msg)41 static void micro_key_receive(void *data, int len, unsigned char *msg)
42 {
43 struct ipaq_micro_keys *keys = data;
44 int key, down;
45
46 if (len < 1)
47 return;
48
49 down = 0x80 & msg[0];
50 key = 0x7f & msg[0];
51
52 if (key < ARRAY_SIZE(micro_keycodes)) {
53 input_report_key(keys->input, keys->codes[key], down);
54 input_sync(keys->input);
55 }
56 }
57
micro_key_start(struct ipaq_micro_keys * keys)58 static void micro_key_start(struct ipaq_micro_keys *keys)
59 {
60 guard(spinlock_irq)(&keys->micro->lock);
61
62 keys->micro->key = micro_key_receive;
63 keys->micro->key_data = keys;
64 }
65
micro_key_stop(struct ipaq_micro_keys * keys)66 static void micro_key_stop(struct ipaq_micro_keys *keys)
67 {
68 guard(spinlock_irq)(&keys->micro->lock);
69
70 keys->micro->key = NULL;
71 keys->micro->key_data = NULL;
72 }
73
micro_key_open(struct input_dev * input)74 static int micro_key_open(struct input_dev *input)
75 {
76 struct ipaq_micro_keys *keys = input_get_drvdata(input);
77
78 micro_key_start(keys);
79
80 return 0;
81 }
82
micro_key_close(struct input_dev * input)83 static void micro_key_close(struct input_dev *input)
84 {
85 struct ipaq_micro_keys *keys = input_get_drvdata(input);
86
87 micro_key_stop(keys);
88 }
89
micro_key_probe(struct platform_device * pdev)90 static int micro_key_probe(struct platform_device *pdev)
91 {
92 struct ipaq_micro_keys *keys;
93 int error;
94 int i;
95
96 keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL);
97 if (!keys)
98 return -ENOMEM;
99
100 keys->micro = dev_get_drvdata(pdev->dev.parent);
101
102 keys->input = devm_input_allocate_device(&pdev->dev);
103 if (!keys->input)
104 return -ENOMEM;
105
106 keys->input->keycodesize = sizeof(micro_keycodes[0]);
107 keys->input->keycodemax = ARRAY_SIZE(micro_keycodes);
108 memcpy(keys->codes, micro_keycodes, sizeof(keys->codes));
109
110 keys->input->keycode = keys->codes;
111
112 __set_bit(EV_KEY, keys->input->evbit);
113 for (i = 0; i < ARRAY_SIZE(micro_keycodes); i++)
114 __set_bit(micro_keycodes[i], keys->input->keybit);
115
116 keys->input->name = "h3600 micro keys";
117 keys->input->open = micro_key_open;
118 keys->input->close = micro_key_close;
119 input_set_drvdata(keys->input, keys);
120
121 error = input_register_device(keys->input);
122 if (error)
123 return error;
124
125 platform_set_drvdata(pdev, keys);
126 return 0;
127 }
128
micro_key_suspend(struct device * dev)129 static int micro_key_suspend(struct device *dev)
130 {
131 struct ipaq_micro_keys *keys = dev_get_drvdata(dev);
132
133 micro_key_stop(keys);
134
135 return 0;
136 }
137
micro_key_resume(struct device * dev)138 static int micro_key_resume(struct device *dev)
139 {
140 struct ipaq_micro_keys *keys = dev_get_drvdata(dev);
141 struct input_dev *input = keys->input;
142
143 guard(mutex)(&input->mutex);
144
145 if (input_device_enabled(input))
146 micro_key_start(keys);
147
148 return 0;
149 }
150
151 static DEFINE_SIMPLE_DEV_PM_OPS(micro_key_dev_pm_ops,
152 micro_key_suspend, micro_key_resume);
153
154 static struct platform_driver micro_key_device_driver = {
155 .driver = {
156 .name = "ipaq-micro-keys",
157 .pm = pm_sleep_ptr(µ_key_dev_pm_ops),
158 },
159 .probe = micro_key_probe,
160 };
161 module_platform_driver(micro_key_device_driver);
162
163 MODULE_LICENSE("GPL");
164 MODULE_DESCRIPTION("driver for iPAQ Atmel micro keys");
165 MODULE_ALIAS("platform:ipaq-micro-keys");
166